What next after Janet and Roy?

[HavelockVetinari]

A friend and I are engaged in a long-term war of funny but not unkind pranks. The last one I did was Janet and Roy around Christmas, friend has since upped the game and I need an amusing revenge suggestion.

Please could you lovely people regale me with your cunning plans/stories of successful pranking?

Next year perhaps, but identical Valentines Cards arriving from all over the country is quite funny.

A folded letter filled with glitter, postcards from random places etc